From: Joseph Myers <joseph@codesourcery.com>
Date: Sun, 1 May 2005 10:44:09 +0000 (+0100)
Subject: re PR c/21213 (segfault declaring a transparent union)
X-Git-Tag: releases/gcc-3.4.4~57
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3e577da2b56c36a92bbd789afc68972d7f566a45;p=thirdparty%2Fgcc.git

re PR c/21213 (segfault declaring a transparent union)

	PR c/21213
	* c-decl.c (finish_struct): Don't dereference NULL TYPE_FIELDS of
	transparent union.

testsuite:
	* gcc.dg/transparent-union-3.c: New test.

From-SVN: r99063
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index f3f0b79cd620..3143721d4b40 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2005-05-01  Joseph S. Myers  <joseph@codesourcery.com>
+
+	PR c/21213
+	* c-decl.c (finish_struct): Don't dereference NULL TYPE_FIELDS of
+	transparent union.
+
 2005-05-01  Joseph S. Myers  <joseph@codesourcery.com>
 
 	PR c/20740
diff --git a/gcc/c-decl.c b/gcc/c-decl.c
index 1481fcf89cf2..619b221063b9 100644
--- a/gcc/c-decl.c
+++ b/gcc/c-decl.c
@@ -5132,7 +5132,7 @@ finish_struct (tree t, tree fieldlist, tree attributes)
      make it one, warn and turn off the flag.  */
   if (TREE_CODE (t) == UNION_TYPE
       && TYPE_TRANSPARENT_UNION (t)
-      && TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t)))
+      && (!TYPE_FIELDS (t) || TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t))))
     {
       TYPE_TRANSPARENT_UNION (t) = 0;
       warning ("union cannot be made transparent");
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index c0ac69e59d50..67bc542aa978 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2005-05-01  Joseph S. Myers  <joseph@codesourcery.com>
+
+	PR c/21213
+	* gcc.dg/transparent-union-3.c: New test.
+
 2005-05-01  Joseph S. Myers  <joseph@codesourcery.com>
 
 	PR c/20740